Hi @Deepanjali ,
IF You are using latest bagistop release v1.2.0-BETA1 then you can use our package generator to generate a payment method package:
just read the readme file point 24 under the summery.
here you can create a base directory structure for your payment method using command.
ELSE please mention exactly what issue you are facing while implementing your payment method. and yes Directory structure must in the form of new package.